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std::chrono::month_weekday_last::ok

From cppreference.com
 
 
Utilities library
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C-style date and time
 
 
constexpr bool ok() const noexcept;
(since C++20)

Checks if the contained month and weekday_last objects are valid.

[edit] Return value

month().ok() && weekday_last().ok()

[edit] Example

#include <iostream>
#include <chrono>
 
int main()
{
    std::cout << std::boolalpha;
 
    auto mwdl {std::chrono::March/std::chrono::Wednesday[std::chrono::last]};
    std::cout << (mwdl.ok()) << ' ';
    mwdl = {std::chrono::month(3)/std::chrono::weekday(42)[std::chrono::last]}; 
    std::cout << (mwdl.ok()) << '\n';
}

Output:

true false